It was near to the Korean town, else where you may walk around 12-15 mins to BTS ASOK, in there also got "Superrich Money Changer" which I found very convenient. 7-Eleven is around 5 Min Walk. Near terminal 21 as well.
The buggy shuttle to the front a bit for the home appear only to work on every day except Sunday and public holiday.
When I was there, the water heater worked perfectly fine, you just need to follow accordingly which way to open the tap for the hot or cold water. Yefeng was a very good host and provide all the details accordingly, You guys can ask him beforehand.